1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*++
/* NAME
/* mkmap_open 3
/* SUMMARY
/* create or rewrite database, generic interface
/* SYNOPSIS
/* #include <mkmap.h>
/*
/* typedef struct MKMAP {
/* struct DICT *(*open) (const char *, int, int); /* dict_xx_open() */
/* struct DICT *dict; /* dict_xx_open() result */
/* void (*after_open) (struct MKMAP *); /* may be null */
/* void (*after_close) (struct MKMAP *); /* may be null */
/* int multi_writer; /* multi-writer safe */
/* } MKMAP;
/*
/* MKMAP *mkmap_open(type, path, open_flags, dict_flags)
/* char *type;
/* char *path;
/* int open_flags;
/* int dict_flags;
/*
/* void mkmap_append(mkmap, key, value, lineno)
/* MKMAP *mkmap;
/* char *key;
/* char *value;
/* int lineno;
/*
/* void mkmap_close(mkmap)
/* MKMAP *mkmap;
/* DESCRIPTION
/* This module implements support for creating Postfix databases.
/* It is a dict(3) wrapper that adds global locking to dict-level
/* routines where appropriate.
/*
/* mkmap_open() creates or truncates the named database, after
/* appending the appropriate suffixes to the specified filename.
/* Before the database is updated, it is locked for exclusive
/* access, and signal delivery is suspended.
/* See dict(3) for a description of \fBopen_flags\fR and
/* \fBdict_flags\fR. All errors are fatal.
/*
/* mkmap_append() appends the named (key, value) pair to the
/* database. Update errors are fatal; duplicate keys are ignored
/* (but a warning is issued).
/* \fBlineno\fR is used for diagnostics.
/*
/* mkmap_close() closes the database, releases any locks,
/* and resumes signal delivery. All errors are fatal.
/* SEE ALSO
/* sigdelay(3) suspend/resume signal delivery
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <dict.h>
#include <sigdelay.h>
#include <mymalloc.h>
#include <stringops.h>
#include <mkmap.h>
/* mkmap_close - close database */
void mkmap_close(MKMAP *mkmap)
{
/*
* Close the database.
*/
dict_close(mkmap->dict);
/*
* Do whatever special processing is needed after closing the database,
* such as releasing a global exclusive lock on the database file.
* Individual Postfix dict modules implement locking only for individual
* record operations, because most Postfix applications don't need global
* exclusive locks.
*/
if (mkmap->after_close)
mkmap->after_close(mkmap);
/*
* Resume signal delivery.
*/
if (mkmap->multi_writer == 0)
sigresume();
/*
* Cleanup.
*/
myfree((void *) mkmap);
}
/* mkmap_open - create or truncate database */
MKMAP *mkmap_open(const char *type, const char *path,
int open_flags, int dict_flags)
{
MKMAP *mkmap;
const DICT_OPEN_INFO *dp;
/*
* Find out what map type to use.
*/
if ((dp = dict_open_lookup(type)) == 0)
msg_fatal("unsupported map type: %s", type);
if (dp->mkmap_fn == 0)
msg_fatal("no 'map create' support for this type: %s", type);
if (msg_verbose)
msg_info("open %s %s", type, path);
/*
* Do whatever before-open initialization is needed, such as acquiring a
* global exclusive lock on an existing database file. Individual Postfix
* dict modules implement locking only for individual record operations,
* because most Postfix applications don't need global exclusive locks.
*/
mkmap = dp->mkmap_fn(path);
/*
* Delay signal delivery, so that we won't leave the database in an
* inconsistent state if we can avoid it.
*/
sigdelay();
/*
* Truncate the database upon open, and update it. Read-write mode is
* needed because the underlying routines read as well as write. We
* explicitly clobber lock_fd to trigger a fatal error when a map wants
* to unlock the database after individual transactions: that would
* result in race condition problems. We clobbber stat_fd as well,
* because that, too, is used only for individual-transaction clients.
*/
mkmap->dict = mkmap->open(path, open_flags, dict_flags);
mkmap->dict->lock_fd = -1; /* XXX just in case */
mkmap->dict->stat_fd = -1; /* XXX just in case */
mkmap->dict->flags |= DICT_FLAG_DUP_WARN;
mkmap->multi_writer = (mkmap->dict->flags & DICT_FLAG_MULTI_WRITER);
/*
* Do whatever post-open initialization is needed, such as acquiring a
* global exclusive lock on a database file that did not exist.
* Individual Postfix dict modules implement locking only for individual
* record operations, because most Postfix applications don't need global
* exclusive locks.
*/
if (mkmap->after_open)
mkmap->after_open(mkmap);
/*
* Wrap the dictionary for UTF-8 syntax checks and casefolding.
*/
if ((mkmap->dict->flags & DICT_FLAG_UTF8_ACTIVE) == 0
&& DICT_NEED_UTF8_ACTIVATION(util_utf8_enable, dict_flags))
mkmap->dict = dict_utf8_activate(mkmap->dict);
/*
* Resume signal delivery if multi-writer safe.
*/
if (mkmap->multi_writer)
sigresume();
return (mkmap);
}
|
